Can we consider two different LAN in a organization as a WAN.

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networking

LAN

domain

connection

I have to perform a sample test which require a WAN and a LAN, having a communication medium between them.

I have a clear idea about LAN and WAN networks but what i am looking for is :

1. Can we consider two different LAN in our network as a WAN ? If yes then how can be build it in any organization ?

Internet <---------> ISP <------>WAN
         |
         |
        LAN's

here we have multimule LAN's created in an organization so can we consider it as a WAN ?


2. Can we Create multiple WAN using single ISP [single public IP from ISP]


Any help will be highly appreciated.
Thanks in advanced.